NASA's Spirit rover completed its first full day on Mars Sunday, sending back black-and-white pictures of its Gusev Crater landing site, the first of a stream of images that are eventually expected to reveal the Martian surface in unprecedented detail. The rover sent an initial burst of data and...

The drivers of the Opportunity rover, a 400-pound robot sent to scour the Martian surface for signs of water, have been navigating the Red Planet without much fanfare. Full story: Curiosity is new Mars star, but Opportunity's still knocking